如何从商店获取唯一/不同的数据？

Question

我正在使用extjs。我需要根据要求从存储中检索不同的数据。我的商店中包含单个列表而不是嵌套列表，该列表具有诸如AMERICAS，North Sea和SE Asia的区域。这些区域本身具有subRegion，vesselName和vesselType值。我需要根据区域检索唯一值，因为它包含许多重复的记录。我尝试了如下操作，但是它没有用。有人可以联系我如何实现吗？。非常感谢。谢谢。

var vesselStore=Ext.getStore('VesselStatusReportStore');
        var arr=new Array();
        var obj;      
        vesselStore.each(function(rec,index)
        {
            obj=new Object();
            if(rec.get('region')=='AMERICAS'){
                obj.subRegionAmerica=rec.get('subRegion');
                obj.vesselNameAmerica=rec.get('vesselName');
                obj.vesselTypeAmerica=rec.get('vesselType');
            }
            if(rec.get('region')=='NorthSea'){
                obj.subRegionNorthSea=rec.get('subRegion');
                obj.vesselNameNorthSea=rec.get('vesselName');
                obj.vesselTypeNorthSea=rec.get('vesselType');
            }
            if(rec.get('region')=='SE Asia'){
                obj.subRegionSEAsia=rec.get('subRegion');
                obj.vesselNameSEAsia=rec.get('vesselName');
                obj.vesselTypeSEAsia=rec.get('vesselType');
            }
            arr.push(obj);
            console.log(obj);
        });

杰森：

[ { 
    "region" : "AMERICAS",
    "startDate" : null,
    "subRegion" : "US",
    "vesselName" : "Thoma-Sea � Hull #147",
    "vesselType" : "PSV"
  },
  { 
    "region" : "AMERICAS",
    "startDate" : null,
    "subRegion" : "US",
    "vesselName" : "Thoma-Sea � Hull #148",
    "vesselType" : "PSV"
  },
  { 
    "region" : "AMERICAS",
    "startDate" : null,
    "subRegion" : "Mexico",
    "vesselName" : "Thoma-Sea � Hull #148",
    "vesselType" : "PSV"
  }]

Answer 1

看来您想使用收集。 http://docs.sencha.com/ext-js/4-1/#!/api/Ext.data.Store-method-collect

vesselStore.collect('region')